Logic Friday is a freeware designed for students, amateurs, and even the engineers who work with digital logic circuits (based on standard IC packages). This program is quite usefull when it comes to analyze combinatorial logic, which deals with the minimization, and synthesis. You can get a logical function as a truth table, equation or graph from the grid and reduce the software. You can automatically generate a multi-level diagram. You can also follow the logic gate, compare functions, search functions generate C code, and much more.